Spraying machine



June 30, 1936. H CQLE 2,046,149

SPRAYING MACHINE Filed Jan. 16, 1950 51. Hm 7.1L

Patented June 30, 1936 UNITED STATES PATENT OFFICE SPRAYING MACHINE Harry 0. Cole, Philadelphia, Pa.

Application January 16, 1930, Serial No. 421,112

8 Claims.

The principal objectof the present invention is to spray liquid upon surfaces, such as paper and .the like, in substantially the same form and character of appropriate spray but in the same or different quantities per unit of time. Another object of the invention is to provide for spraying liquidvin an appropriate character of spray and in what may be regarded as relatively large quantitles in comparison with spraying machines now 'in use, for example, principally for spraying melted. paraffine in the printing industry in which the quantity of parafiine sprayed per unit of time is very small. Another object of the inventionis to make the character of the spray subl5-stantially independent of the quantity of liquid or 'fluid sprayed per unit of time.

Other objects of the invention will appear from the following description and the invention, generally stateimay be said to comprise a machine :for spraying liquid in substantially the same form and character 'of spray and in the same or difierent quantities per unit of time which includes a reservoir exposed to atmospheric pressure provided witha nozzle and with pneumatic means adapted for cooperation with the nozzle to providea spray of desired form, a pressure chamber having an orifice arranged to discharge liquid into the reservoir in quantity proportionate to the pressure in the chamber, and means for varying the pressure of the liquid in the chamber to pass different quantities of liquid throughthe orifice per unit of time, whereby changes in the form of a jet escaping through the orifice induced by different pre'ssures'are' not reflected in the form 3 or' character of the spray provided at the nozzles.

' The invention'also comprises the improvements. to be presently described and finally claimed.

In the following description reference will be' "made to the accompanying drawing forming part hereof and in which T Figure l is a diagrammatic View partly in vertical section and partly in elevation.

Fig. 2 is a horizontal section taken on the line 2-2 of Figure 1, and

Fig. 3 is a detached View of one of the parts hereinafter described.

Referring to the drawing l is a reservoir and it is shown as provided with a tangentially arranged inlet 2 vented to the atmosphere as by means of the duct 3, so that the reservoir is exposed to atmospheric pressure which is substantially constant. The reservoir l is provided with a nozzle 4 shown as communicating with the base of the reservoir. Within comparatively wide limits the size of this nozzle is not important although it should be in general appropriate to the upper and lower limits of the quantity of liquid that is likely to be required per unit of time. There are pneumatic means adapted to cooperate with the nozzle 4 to provide a spray of the desired form and character and the form and character of the spray is under control and may be appropriately varied or adjusted. As shown these means comprise a protection plate 5, an intermediate plate 6 somewhat shorter than the plate 5, and an air liner 1. These parts extend across the device shown in Fig. 2 which includes a repetition of the elements already described. However, the air liner 1 is notched as at 8, Fig. 3, and the notches communicate with passages 9 leading from an air trunk II! that extends across the machine or device and to one end of which air under pressure is supplied by means of the connection H. The pressure of the air supplied to the connection H is under control. I2 is a pressure chamber shown to extend across the de vice and having an orifice l3 arranged to discharge liquid into the reservoir I, or more accurately, into the tangentially arranged inlet passage thereof. |4 represents means for introducing liquid under pressure into the chamber l2. The liquid supplied through the connection l4 may be of substantially any character and water is an example. The connection 14 is shown as provided with a pressure gauge l5 and with a pressure reducing valve l6. I1 is a screen for excluding foreign matter from the orifice l3. There are means for cleaning the orifice I3 and they are shown to comprise a pin [8. There are a number of these pins l8 and each is guided at one end by a tubular guide l9. At the other end the pins are connected to a bar 20 slidable in ways 2|. There are links 22 pivoted at one end to brackets 23 and they engage the bar 20, and the other ends of these links are connected with a rod 24. The rod 24 is connected to the piston 25 of the cylinder 26. The cylinder 26 is connected with a pressure pipe 21. By cutting off pressure and exhausting either the cylinder 26 or the chamber 12, by means of the valves 28 or 29, it is possible to project the pins l8 into the orifices l3 and to retract the pins from those orifices thus cleaning the latter.

The mode of operation of the device may be described as follows:

Under any given condition of pressure of liquid in the chamber l2 the quantity of liquid passing through the orifice I3 into the reservoir I per unit of time is a function of the pressure 55 and is constant. It the pressure is increased the thereby since the pressure in the reservoir l is I substantially constant,

quantity of liquid leaving the nozzle 4- perunit I of time can be increased or diminished by changso that although the ing the pressure in the chamber 12', still the character of the spray is 'controlledby the air. escaping through the notches 8, and it, can be made of any form and character desired." From the foregoing description it will be understood.

that the spray provided across the device is uniform although it can be varied as to quantity while preserving an appropriate form or character; V 7

'It' will be obviousto those skilled in theart to which'the; invention relates that modifications may be made in details of construction and ar- 'rangement and matters of mereform without departing from the spirit of the invention which is not limited to such matters or otherwise than the prior art and the appended claims may require.

I claim '1. Armac'hine for spraying liquid in substantially thesame form and character and in constant quantity per unit of time comprising in combination a reservoir exposed to atmosphericpressure and provided with a permanentlyflopen nozzle and with pneumatic means adapted for cooperation with the nozzle to provide a spray andcontrol the form and character thereofia' closed, pressure chamber, having anorifice per-V manently open in operation and arranged to discharge liquid into' the reservoir in quantity proportionate to the pressure in the chamber,

and. means for supplying liquid under pressure to the chamber to fill the chamber with liquid undernpressure.

'2. A machine for spraying liquid in substantially the same form and character and in constant quantity per unit of time comprising in combination a reservoir exposed to atmospheric pressure and provided with a: permanently open.

nozzle and with pneumatic 'meansadapted for cooperation with the nozzle to provide a spray, a closed pressure chamber havingan orifice permanently open in operation and arranged to discharge liquid into the reservoirlin quantity proportionate to the pressure in the chamber to fillthe same with liquid under pressure,; means for supplying liquid under pressure to the chamw her, and means for varying the pressure of the liquid supplied to the chamber. 7

3. In a machine for spraying liquid the combination of a reservoir vented to the atmosphere,

a permanently open nozzle arranged to discharge irom the reservoir; pneumatic means for cooperation with the'nozzle to provide a spray, an orifice permanently open in operation and at the inlet of the reservoir, and closed means for discharging fluidunder different pressure through the orifice into the reservoir.

4. In a machine for spraying liquid the combination of closed means including an orifice permanently open in operation, means for passing fiuid under pressure into the first mentioned .means to fill the same and through the orifice,

a'reservoir having means for maintaining. substantially constant pressure within it and into,

which the orifice discharges, a permanently open nozzle throug h which the reservoir discharges. and pneumatic means cooperating with the nozzle.

5 In a machine for spraying liquid the combination of a series ofreservoirs each having a permanently open discharge nozzle and pneumatic spray means and each vented to the atmosphere, a. closed pressure chamber common to. the'reservoirs andhaving orifices permanently open in operation and respectively communicatingwith the reservoirs, and means for introducing a supplyof liquid under pressure in thepr'es 'sure chamber to keep the same full of liquid.

underpressure.

6. A spraying device of the character described including reservoirs vented to the atmosphm'e, a nozzle and its complemental pneumatic device 7 for each reservoir, a pressure chamber having a series of orifices communicating respectively with thereservoirs, pins arranged in the chamber and projectable and retractable in respect to the oriconnections for actuating the pins.

7. In a machine of the class described permanently open" spraying devices, means for feeding liquid to the spraying devices which comprise permanently open orifices, vented reservoirs'into which the orifices discharge and which are ar 407i fices, and piston and cylinder devices andtheir g ranged to supply the spraying devices, closed pressure chambers for discharging liquid under pressure through the orifices and means for feed ing liquid under pressure to the pressure chambers.

8. In a machine of the type described spraying devices nently open orifices adapted to discharge into the reservoirs, and. means for'discharging liquid under controlled pressure through the; orifices. which include closed pressure chambers, andincluding vented reservoirs, 'permameans for supplying liquid under pressure to 60 the chamber. 1 q r HARRY C. COLE; 

